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US3799683A Expired / Lapsed US ⏱️ 0.0 years remaining

Flow-through sample cells which determine their own fill level

Assignee: PE Manufacturing GmbH
•
Filing: 1972-10-16
•
Granted: 1974-03-26
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Expires: 1992-10-16
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Abstract

Abstract A sample cell for liquids includes an inlet channel, a main sample-holding bore and an outlet channel, so that the liquid sample may be introduced through the inlet channel for filling the cell and, subsequent to sample measurement, sucked out via the outlet channel. In order to fill the cell to the same predetermined liquid level with each discrete sample liquid (having a volume at least somewhat larger) an additional bypass path is provided between specific points of the inlet and outlet channels. Once the trailing end of the liquid sample column reaches the interconnection between the inlet channel and the bypass path, sample flow through the cell ceases and the succeeding air passes through the short-circuit path, so that a specific volume of the sample is retained in the sample cell. Preferably the cell is filled by a relatively low vacuum (or pressure) and emptied subsequent to sample measurement by a relatively high vacuum (or pressure). Specifically the cell may be filled by a hose pump attached to the outlet channel and may be emptied by a high vacuum maintained in a waste bottle.

Inventors

  • 👤 W Gunner

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 13:30
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/03; G01N21/05; G01N35/00; G01N35/10; G01N35/1095

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 128 words
In a sample cell for liquids of the type having a continuous flow-through path for sample liquids, said continuous path comprising an inlet channel, a main aperture bore and an outlet channel, the improvement comprising: an additional bypass connection, having its respective ends connected as ports with specific parts of said inlet and said outlet channels, the flow resistance of said bypass connection relative to the sample liquid being substantially greater than the combined flow resistance of the inlet channel, the main aperture bore and the outlet channel which are bypassed thereby, whereby said bypass connection defines an additional parallel path between said inlet and outlet channels, bypassing said main aperture bore, and said ports determine the set-point value of desired filling of the cell with sample liquid.
Claim 2
Dependent Claim 128 words
In a sample cell for liquids of the type having a continuous flow-through path for sample liquids, said continuous path comprising an inlet channel, a main aperture bore and an outlet channel, the improvement comprising: an additional bypass connection, having its respective ends connected as ports with specific parts of said inlet and said outlet channels, the flow resistance of said bypass connection relative to the sample liquid being substantially greater than the combined flow resistance of the inlet channel, the main aperture bore and the outlet channel which are bypassed thereby, whereby said bypass connection defines an additional parallel path between said inlet and outlet channels, bypassing said main aperture bore, and said ports determine the set-point value of desired filling of the cell with sample liquid.
Claim 3
Dependent Claim 62 words
An improved sample cell according to claim 1, in which: said specific parts of said inlet and outlet channels are at least adjacent the ends of said respective channels remote from said main aperture bore, whereby the additional path afforded by said bypass connection bypasses at least substantially all of said inlet and outlet channels as well as said main aperture bore.
Claim 4
Dependent Claim 55 words
An improved sample cell according to claim 1, in which: said bypass connection is of such construction as to have a flow resistance for liquids which is at least of the same order of magnitude as the flow resistance of the other path defined by said inlet channel, said aperture bore and said outlet channel.
Claim 5
Dependent Claim 65 words
An improved sample cell according to claim 1, in which: said inlet and said outlet channels are substantially parallel to each other and form the legs of a substantially U-shaped path in conjunction with said main aperture bore, said bypass connection comprising a substantially straight line connection between the ends of said U-shaped path by interconnecting the upper ends of said inlet and outlet channels.

References Cited (Backward Citations)

US3689164A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-03-25 1977-09-24 1978-03-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-03-25 1981-09-24 1982-03-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-03-25 1985-09-24 1986-03-26 $7700.00 Window Closed / Lapsed

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